So I did an outdoor metric century today (118km) and when I try to look at my activity (uploaded from Strava) in more detail an error pops up saying ‘Signature is Invalid.’ I stopped for about 45 minutes during the ride and did not pause my Garmin but it does pause automatically (not sure if it would have anything to do with the invalid signature, just mentioning it in case it does).
My last breakthrough effort was 3 days ago on Zwift.
The ride in itself isn’t going to change much in your signature.
You could delete the ride and enter the data manually.
I suspect the Garmin pause is connected with the invalid signature. Or you could recalculate your signature.